Hello, Afnan.
It seems your connection issue with the Amex Plum 2008 could be due to some unusual behavior. Let's try a few troubleshooting steps to resolve this matter.
First, let's refresh your browser to help reload the page and clear minor issues or cached data that might be causing the error.
Next, sign out of your QuickBooks Online account and then sign back in before reconnecting your Amex bank account. This helps reset your session and can resolve temporary glitches related to the browser. A fresh login ensures the system reconnects properly.
If the issue persists, try accessing your QuickBooks account through a private or incognito browser. Doing so bypasses any browser extensions, cookies, or cached files that could potentially interfere with the connection.
Alternatively, consider switching to a different supported browser, like Google Chrome, to improve compatibility and potentially enhance performance.
If you have any further concerns, please feel free to reach out. We're here to help.